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Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
Within only two years, both 724 and 412 were nearing exhaustion due to rapid growth of telecommunication services in the Pittsburgh area from proliferation of cell phones and pagers. By this time, overlays had gained more acceptance, and area code 878 was implemented as an overlay complex with both the 412 and 724 territories on August 17, 2001 ...
Area code 570 was created when the 717 numbering plan area was divided on December 5, 1998. It was the first new Pennsylvania area code created outside Philadelphia and Pittsburgh since the implementation of the area code system. In 2009, it was projected that 570 would run out of numbers in the third quarter of 2011.
Telephone companies often give names to their central offices. [9] The names frequently relate to the name given to the exchanges served from that office in the days of two-letter, five-number dialing, where a telephone number might have been referred to as "MOhawk 3-1234". The numbers are now listed as all-figures, so (713) MOhawk x-xxxx ...
Under all-number calling, the number of permissible central office prefixes increased from 540 to potentially 800, but the first two digits of the central office code were still restricted to the range 2 to 9, and the eight combinations that ended in 11 were reserved as special calling codes. [2]
Area code 412 is a telephone area code in the North American Numbering Plan (NANP) for the Commonwealth of Pennsylvania. The numbering plan area (NPA) comprises the city of Pittsburgh , most of surrounding Allegheny County , and small portions of Washington and Westmoreland counties.
A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme. In other countries, both the prefix and the number may have ...
The need for new phone numbers in area codes 215/267 was delayed until 2018. Area code 445 was activated as an additional overlay code on February 3, 2018. [ 3 ] This had the effect of assigning 23 million telephone numbers to a service territory of four million people, and 215/267/445 is not projected by the NANP to need a fourth area code ...
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